Starting with CloneCD release version 6 we will be changing the format of the serial registration number. If you wish to receive further updates of cloneCD we will require your present CloneCD serial. Once we receive it, we will present you with a new one.

Thank you
(Please send your present serial to elby@worldmailer.com)

Of course this email is a hoax and doesn't come from the CloneCD author! So be careful about such emails…